AP's report is now updated with more detail (3:00PM Pacific):
WASHINGTON - Sen. Barack Obama of Illinois sealed the Democratic presidential nomination Tuesday, a historic step toward his once-improbable goal of becoming the nation's first black president. A defeated Hillary Rodham Clinton maneuvered for the vice presidential spot on his fall ticket.
...Obama sealed his nomination based on primary elections, state Democratic caucuses and delegates' public declarations as well as support from 22 delegates and "superdelegates" who privately confirmed their intentions to The Associated Press. It takes 2,118 delegates to clinch the nomination at the convention in Denver this summer.
Update - 11:05AM: A number of superdelegates won't come out until after the campaign is over. So far today, Barack has picked up at least 6.5. MSNBC reports that he is 29 away; DCW has him at 32.5 away. AP's report is includes a tally of supers who have not publicly revealed their preference but will do so tonight.
Update - 11:11AM: Here's an example of a super that will endorse when the polls close: St. Paul Mayor Chris Coleman. And here's an example of three more: MT Gov. Brian Schweitzer and Sens. Max Baucus and Jon Tester.
Update - 11:25AM: Chuck Todd says: (1) Obama is getting what he needs to go over the top tonight. He says it's now 5 in Montana and another 4 that he knows of who will come out when the polls close. (2) He says the Clinton campaign doesn't want to concede, thereby hurting turnout, because they want to score a meaningless touchdown in South Dakota.
Update - 11:26AM: I'm debating whether to bite my tongue about extraordinary selfishness displayed by point #2 in the 11:25 update. 11:27AM: Chuck does some more HRC for VP talk. NO!
Update - 11:38AM: I've removed the delegate count widget from the sidebar -- things are happening so fast that it is out-of-date. DCW's current tally has Obama 30.5 delegates away. 11:42AM: MSNBC has it at 28.5.
© Jed Lewison